private void listViewControllers_SelectedIndexChanged(object sender, EventArgs e)
{
if(listViewControllers.SelectedItems.Count > 1 || listViewControllers.SelectedItems.Count == 0) {
_PopulateFormWithController(null);
} else {
_PopulateFormWithController(listViewControllers.SelectedItems[0].Tag as OutputPreview);
}
}